Cu2＋与草甘膦单一及复合污染对蚯蚓的急性毒性研究

Acute and joint toxicity of Cu^(2+) and glyphosate to earthworm Eisenia foetida

含铜杀菌剂与除草剂草甘膦是农业生产中常见的农药,它们在土壤中共存可能造成复合污染。以赤子爱胜蚓(Eisenia foetida)为例,通过滤纸接触法研究了Cu2+与草甘膦对赤子爱胜蚓的单一与复合急性毒性效应。单一急性毒性试验结果表明,两者对赤子爱胜蚓均有毒性,Cu2+的毒性大于草甘膦,Cu2+和草甘膦48h半数有效浓度(EC50)分别为25.1、657.3mg/L。同时通过观察可知,Cu2+以皮肤渗入赤子爱胜蚓体内的毒性效应高于草甘膦。复合急性毒性试验结果表明,草甘膦与Cu2+存在拮抗作用,草甘膦的存在能够在一定程度上降低Cu2+对土壤生态系统的潜在危害。

Copper contained fungicides and herbicide glyphosate were widely used in orchards and other agriculture ecosystems. Co-existing of Cu2＋ and glyphosate might result combined pollution to soil environment. Contact filter paper test was employed to determine the acute and joint toxicity of Cu2＋ and glyphosate to earthworm population. The result showed that Cu2＋ exhibited higher acute toxicity than glyphosate, 48 h half-effective concentration （EC50） of Cu2＋ and glyphosate were 25.1 mg/L and 657.3 rag/L, respectively. The joint toxicity date showed that glyphosate decreased the toxicity of Cu2＋. There might be antagonistic effect between glyphosate and Cu2＋.